US3997318A - Plunger for forming hollow glass articles - Google Patents

Plunger for forming hollow glass articles Download PDF

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Publication number
US3997318A
US3997318A US05/623,017 US62301775A US3997318A US 3997318 A US3997318 A US 3997318A US 62301775 A US62301775 A US 62301775A US 3997318 A US3997318 A US 3997318A
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US
United States
Prior art keywords
cooling system
main
plunger
cooling
nose piece
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/623,017
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English (en)
Inventor
Yoshio Takatoki
Mitsuo Nakata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AGC Inc
Original Assignee
Asahi Glass Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Asahi Glass Co Ltd filed Critical Asahi Glass Co Ltd
Application granted granted Critical
Publication of US3997318A publication Critical patent/US3997318A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
    • C03B11/12—Cooling, heating, or insulating the plunger, the mould, or the glass-pressing machine; cooling or heating of the glass in the mould
    • C03B11/125—Cooling
    • C03B11/127—Cooling of hollow or semi-hollow articles or their moulds

Definitions

  • the present invention relates generally to a plunger used for forming hollow glass articles, and more particularly to a plunger which incorporates a dual cooling system therein for separately cooling different portions thereof.
  • Plungers used for forming hollow glass articles such as, for example, funnels for TV glass bulbs or tubes, have a nose piece projecting outwardly of its main pressing surface which is used for forming the funnel-shaped projecting bottom part of the TV tube.
  • Such plungers are subjected to the extremely high temperatures of the molten glass disposed within the bottom mold at the time of the press forming operation, and therefore, conventionally has cooling equipment, for cooling the same, incorporated therein.
  • the thickness of the nose piece per se was made different, in accordance with conventional practice, however, regarding such products as the previously mentioned TV funnels, which have extreme differences in glass thickness, it is nevertheless difficult to perform adequate cooling over all parts thereof wherein the glass thickness is sometimes large and with respect to other areas wherein it is excessively thin, when using a refrigerant having an identical cooling efficiency throughout its operation. Consequently, adequate temperature control of the plunger has not been possible to obtain.
  • a plunger used for forming hollow glass articles and provided with a nose piece projecting outwardly of its pressing surface, wherein a main cooling system is used for cooling the main forming surface extending around the nose piece, and a sub-cooling system located interiorly of the nose piece is utilized for cooling the nose piece, the temperature of the nose piece being controlled by using a refrigerant having a different cooling efficiency within the sub-cooling system than that of the refrigerant used within the main cooling system.
  • FIG. 1 is a side elevation view of the plunger apparatus constructed in accordance with the present invention and showing its cooperative parts;
  • FIG. 2 is a cross-sectional view of the apparatus of FIG. 1 taken along the line A--A of FIG. 1;
  • FIG. 3 is a longitudinal cross-sectional view of the apparatus of FIG. 1 showing the particular structure of the cooling system characteristic of the present invention.
  • a plunger 1 has a forming surface which includes a generally rectangular base portion and a funnel-shaped forward portion, the central portion of the forward portion being provided with an axially extending nose piece projecting forwardly thereof.
  • the plunger 1 is also installed upon the front end of a reciprocable piston rod 18 of a cylinder mechanism, not shown, and consequently, the molten glass which is fed into a bottom mold 2, as seen within FIG. 3, is pressed by means of the plunger 1.
  • the nose piece 3 forms the neck seal portion of the TV funnel and the main forming surface extending rearwardly of and around the nose piece 3 forms the remaining parts of the funnel which likewise extend rearwardly of and about the neck seal portion of the TV funnel. It is thus seen to be quite important that the shape of the nose piece 3 is such as to project forwardly of the main forming surface and such shape can be suitably selected depending upon the shape of the TV funnel desired.
  • the cooling system comprises a main cooling system utilized for cooling the main forming surface of the plunger, and a secondary cooling system which substantially cools the nose piece 3, the main or primary cooling system being disposed throughout the interior portion of the plunger defining and supporting the main forming surface so as to cool the main forming surface from the inside of the plunger, and the sub-cooling system is disposed interiorly of the nose piece 3 and independently of the main cooling system.
  • the main cooling system comprises an inner member 8 having a contour substantially corresponding to that of the main forming surface of the plunger and disposed axially rearwardly of the main surface portion so as to define therewith a substantially radially extending chamber or space 10 within which cooling water can flow, the cooling water being supplied thereto by means of an inlet 12, an annular cavity 9 defined within and disposed rearwardly of the inner member 8, and a plurality of small holes or apertures 11 defined within inner member 8.
  • the coolant serves to cool the interior portion of the main pressing surface of the plunger during the pressing operation.
  • the cooling water is exhausted or drained through means of an outlet 13, and in this manner, the plunger's main pressing surface is cooled, and the temperature thereof controlled to the desired temperature, by means of a flow of an adequate quantity of cooling water which is continuously circulated through the aforenoted flow channels and throughout the system.
  • the secondary cooling system is, as noted heretofore, provided independently of the main cooling system, and is seen to comprise a pipe or conduit 17 disposed within a cavity which is partitioned from the main cooling system and which is disposed interiorly of the nose piece of the plunger.
  • the refrigerant utilized within such sub-cooling system has a different cooling efficiency than that of the refrigerant utilized within the main cooling system, and more particularly, the cooling efficiency of the refrigerant utilized within the sub-cooling system is lower than that of the main cooling system refrigerant, and consequently, the nose piece 3 of the plunger 1 is cooled less efficiently than that of the main pressing surface.
  • the cooling air which has a cooling efficiency lower than that of water, is utilized as the refrigerant for the sub-cooling system, thus preventing excessive cooling of the nose piece 3.
  • the cooling air is conducted axially into pipe 17 through means of an inlet passageway 14, and ultimately, the same is exhausted through means of the space defined between the nose piece and the lower end of pipe 17 and an annular space defined about pipe 17 within the nose piece so as to be exhausted through means of an outlet pipe 15, thereby cooling the nose piece 3 during flow therethrough.
  • the cooling apparatus thereof consists of a main and a sub-cooling system, and that the refrigerant for each system has different cooling efficiencies.
  • a refrigerant having a lower cooling efficiency than that of the refrigerant of the main system is utilized for cooling the nose piece 3 of the plunger in order to prevent excessive cooling of the same, and according to numerous experiments, it is considered desirable to employ water, which has been widely used as a refrigerant, for the main cooling system and to use air for the sub-cooling system.
  • refrigerants can be used, or refrigerants of the same kind can be used for both cooling systems, that is, two different fluid gases, or two different fluid liquids, or the like.
  • refrigerant may in fact be used within both systems, and in such cases, the objects of the present invention can nevertheless be attained by adjusting the cooling efficiency affecting the plunger by using a different refrigerant temperature and/or flow rate depending upon whether the refrigerant is used for the main cooling system or the sub-cooling system.
  • the structure of the main cooling system is not limited to the embodiment shown within FIG. 3 and can be suitably altered as long as the desired objects can be attained. What is of paramount importance in any case, is that the selected refrigerants for each of the main and sub-cooling systems cool the plunger from the interior portion thereof so as to obtain a suitable temperature distribution over the entire main pressing surface and nose piece in order to facilitate a smooth pressing operation.
  • the present invention permits the separate control of the cooling efficiency of the refrigerants utilized within both cooling systems by means of structure wherein the nose piece is cooled by means of a sub-cooling system independent of the main cooling system, it is possible to effectively control the cooling of the nose piece 3, which is apt to be excessively cooled, to an adequate temperature, and to efficiently press-form TV funnels using molten glass which is conducted into the bottom mold 2 within the forming cavity surrounded by the shell-mold 6.
  • the temperature of the nose piece 3 can be precisely controlled by means of the sub-cooling system, it is possible to avoid breakage of, or the formation of cracks within, parts of the TV funnels formed by the noise piece at which position the glass thickness is comparatively thin. It can of course be yet further appreciated that the present invention is also usable, not only for the formation of TV funnels, but is likewise effective for other kinds of hollow glass article manufacture.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
US05/623,017 1974-10-16 1975-10-16 Plunger for forming hollow glass articles Expired - Lifetime US3997318A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP11802374A JPS5347253B2 (fr) 1974-10-16 1974-10-16
JA49-118023 1974-10-16

Publications (1)

Publication Number Publication Date
US3997318A true US3997318A (en) 1976-12-14

Family

ID=14726144

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/623,017 Expired - Lifetime US3997318A (en) 1974-10-16 1975-10-16 Plunger for forming hollow glass articles

Country Status (5)

Country Link
US (1) US3997318A (fr)
JP (1) JPS5347253B2 (fr)
DE (1) DE2546459C3 (fr)
FR (1) FR2288066A1 (fr)
GB (1) GB1479395A (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4052189A (en) * 1976-08-05 1977-10-04 Corning Glass Works Apparatus for inhibiting checks and cracks in the moil or yoke area of tv funnels
US4059429A (en) * 1976-10-04 1977-11-22 Corning Glass Works Glass pressing plunger cooling
US4251253A (en) * 1975-08-20 1981-02-17 Hermann Heye Cooling system for molds
US4491486A (en) * 1981-09-17 1985-01-01 Tokyo Shibaura Denki Kabushiki Kaisha Method for manufacturing a semiconductor device
US4790867A (en) * 1987-02-18 1988-12-13 Corning Glass Works Cooling system for glass molding equipment
US5057139A (en) * 1990-11-28 1991-10-15 Emhart Industries, Inc. Plunger mechanism for I.S. machine with thermally isolated conduits
US5632794A (en) * 1995-05-31 1997-05-27 Corning Incorporated Method and apparatus for cooling a glass pressing plunger
US20060158079A1 (en) * 2000-08-17 2006-07-20 Iwasaki Electric Co., Ltd. Method of manufacturing a glass reflector
WO2019195018A1 (fr) * 2018-04-03 2019-10-10 Yeoh Ivan Li Chuen Système de fabrication additive utilisant des sous-unités répétitives interconnectées

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0583842B1 (fr) * 1992-08-20 2000-05-03 Koninklijke Philips Electronics N.V. Procédé de fabrication d'un cône creux et dispositif convenant pour la mise en oeuvre du procédé ainsi que cône réalisé par la mise en oeuvre du procédé et tube à rayons cathodiques muni d'un tel cône

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE179818C (fr) *
US3285728A (en) * 1965-04-21 1966-11-15 Owens Illinois Inc Glass shaping plunger with a mercury mass condenser cooling means

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE179818C (fr) *
US3285728A (en) * 1965-04-21 1966-11-15 Owens Illinois Inc Glass shaping plunger with a mercury mass condenser cooling means

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4251253A (en) * 1975-08-20 1981-02-17 Hermann Heye Cooling system for molds
US4052189A (en) * 1976-08-05 1977-10-04 Corning Glass Works Apparatus for inhibiting checks and cracks in the moil or yoke area of tv funnels
US4059429A (en) * 1976-10-04 1977-11-22 Corning Glass Works Glass pressing plunger cooling
US4094657A (en) * 1976-10-04 1978-06-13 Corning Glass Works Glass pressing plunger cooling
US4491486A (en) * 1981-09-17 1985-01-01 Tokyo Shibaura Denki Kabushiki Kaisha Method for manufacturing a semiconductor device
US4790867A (en) * 1987-02-18 1988-12-13 Corning Glass Works Cooling system for glass molding equipment
US5057139A (en) * 1990-11-28 1991-10-15 Emhart Industries, Inc. Plunger mechanism for I.S. machine with thermally isolated conduits
US5632794A (en) * 1995-05-31 1997-05-27 Corning Incorporated Method and apparatus for cooling a glass pressing plunger
US20060158079A1 (en) * 2000-08-17 2006-07-20 Iwasaki Electric Co., Ltd. Method of manufacturing a glass reflector
US7644596B2 (en) * 2000-08-17 2010-01-12 Iwasaki Electric Co., Ltd. Method of manufacturing a glass reflector
WO2019195018A1 (fr) * 2018-04-03 2019-10-10 Yeoh Ivan Li Chuen Système de fabrication additive utilisant des sous-unités répétitives interconnectées
US11173656B2 (en) 2018-04-03 2021-11-16 Ivan Li Chuen YEOH Additive manufacturing system using interlinked repeating subunits
US11999100B2 (en) 2018-04-03 2024-06-04 Ivan Li Chuen YEOH Additive manufacturing system using interlinked repeating subunits

Also Published As

Publication number Publication date
GB1479395A (en) 1977-07-13
FR2288066A1 (fr) 1976-05-14
DE2546459B2 (de) 1980-03-27
DE2546459C3 (de) 1980-11-27
DE2546459A1 (de) 1976-04-22
FR2288066B1 (fr) 1982-05-07
JPS5145115A (fr) 1976-04-17
JPS5347253B2 (fr) 1978-12-20

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